MP4603ES-LF-Z LED Driver IC Equivalent & Substitute Parts

Part Overview

The MP4603ES-LF-Z is an active LED Driver IC manufactured by Monolithic Power Systems Inc., classified as a Power Management PMIC. This device functions as a 1-output DC DC regulator supporting both Step-Down (Buck) and Step-Up (Boost) topologies with integrated PWM and Analog dimming capabilities. The part delivers 2.5A switch current across a wide input voltage range of 4.5V to 80V, operating at 280kHz frequency in a 16-SOIC surface mount package.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the allowed parameter specifications for LED driver applications, particularly in backlight and lighting systems.

Substiute Parts

MP4603ES-LF-Z

Monolithic Power Systems Inc.In Stock: 5315MP4603ES-LF-Z Datasheet

Current PartRFQ

AL8812FDF-13

Diodes IncorporatedIn Stock: 1067AL8812FDF-13 Datasheet

MFR RecommendedRFQ

LM2705MFX-ADJ/NOPB

Texas InstrumentsIn Stock: 6176LM2705MFX-ADJ/NOPB Datasheet

MFR RecommendedRFQ

LM3404MAX/NOPB

Texas InstrumentsIn Stock: 30111LM3404MAX/NOPB Datasheet

MFR RecommendedRFQ

LT3465AES6#TRMPBF

Analog Devices Inc.In Stock: 2208LT3465AES6#TRMPBF Datasheet

MFR RecommendedRFQ

LT3517EUF#PBF

Analog Devices Inc.In Stock: 3088LT3517EUF#PBF Datasheet

MFR RecommendedRFQ

LT3518IFE#PBF

Analog Devices Inc.In Stock: 2290LT3518IFE#PBF Datasheet

MFR RecommendedRFQ

MAX1910EUB+T

Analog Devices Inc./Maxim IntegratedIn Stock: 12777MAX1910EUB+T Datasheet

MFR RecommendedRFQ

MIC2291-15YML-TR

Microchip TechnologyIn Stock: 15080MIC2291-15YML-TR Datasheet

MFR RecommendedRFQ

NCP3065MNTXG

onsemiIn Stock: 4549NCP3065MNTXG Datasheet

MFR RecommendedRFQ

TPS61169DCKR

Texas InstrumentsIn Stock: 38635TPS61169DCKR Datasheet

MFR RecommendedRFQ

TPS61500PWP

Texas InstrumentsIn Stock: 2106TPS61500PWP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MP4603ES-LF-Z is determined by the following critical parameters:

Primary Substitution Criteria:

• DC DC Regulator type with internal switch
• Single output configuration
• Support for both Step-Down (Buck) and Step-Up (Boost) topologies, or equivalent single topology with compatible voltage range
• Dimming capability (Analog, PWM, or both)
• Current output rating of 1.5A or greater
• Input voltage range overlap with 4.5V minimum and 30V or higher maximum
• Surface mount packaging
• Active product status
• ROHS3 compliance

Secondary Compatibility Factors:

• Operating temperature range of -40°C or lower minimum and 85°C or higher maximum
• Frequency operation within 100kHz to 2.5MHz range
• Moisture Sensitivity Level (MSL) of 2 or better
• Applications in backlight or lighting domains

Substitute parts may operate at different package types, current ratings, or frequency specifications provided they maintain functional equivalence within the allowed electrical parameters for LED driver applications.

Parameter Comparison

Engineering Selection Recommendations

All listed substitute parts maintain Active product status and ROHS3 compliance, ensuring regulatory alignment with the MP4603ES-LF-Z. Selection among substitutes depends on specific application constraints:

Full Topology Equivalents (Buck + Boost): LT3517EUF#PBF, LT3518IFE#PBF, and NCP3065MNTXG provide dual-topology capability matching the MP4603ES-LF-Z. These parts support both step-down and step-up conversion with Analog and PWM dimming. LT3517EUF#PBF and LT3518IFE#PBF extend operating temperature to 125°C (TJ), while NCP3065MNTXG supports higher input voltage (40V maximum). Current ratings range from 1.5A to 2.3A, with LT3518IFE#PBF closest to the 2.5A specification.

Buck-Only Topology: LM3404MAX/NOPB operates as a step-down regulator with PWM dimming, supporting 6V to 42V input and 1A output current. Operating temperature extends to 125°C (TJ) with automotive-grade qualification.

Boost-Only Topologies: LT3465AES6#TRMPBF, TPS61169DCKR, MIC2291-15YML-TR, and LM2705MFX-ADJ/NOPB provide step-up conversion for lower input voltage applications. TPS61169DCKR delivers 1.8A switch current with 2.7V to 5.5V input range and 125°C maximum operating temperature. MIC2291-15YML-TR supports 1.2A with 2.5V to 10V input and 125°C operation.

Charge Pump Alternative: MAX1910EUB+T uses switched capacitor topology for 2.7V to 5.3V input range with 120mA output, suitable for lower-power backlight applications.

Lower Current Alternatives: AL8812FDF-13 and LM2705MFX-ADJ/NOPB provide reduced current ratings (1.6A and 150mA respectively) for applications with lower power requirements.

Frequently Asked Questions (FAQ)

Q: Can LT3517EUF#PBF directly replace MP4603ES-LF-Z in all applications?

A: LT3517EUF#PBF provides equivalent dual-topology (Buck/Boost) and dimming capability (Analog/PWM) with 1.5A switch current versus 2.5A in the MP4603ES-LF-Z. Input voltage range is 3V to 30V compared to 4.5V to 80V. Direct substitution is valid for applications operating within 3V to 30V input range and requiring 1.5A or less output current. Package differs (16-QFN versus 16-SOIC), requiring PCB layout modification.

Q: What is the primary difference between LT3518IFE#PBF and LT3517EUF#PBF?

A: Both support Buck/Boost topology with Analog/PWM dimming and 3V to 30V input range. LT3518IFE#PBF delivers 2.3A switch current (closer to MP4603ES-LF-Z specification) versus 1.5A in LT3517EUF#PBF. LT3518IFE#PBF uses 16-TSSOP-EP packaging while LT3517EUF#PBF uses 16-QFN (4x4).

Q: Why does NCP3065MNTXG support higher input voltage (40V maximum) than LT3517EUF#PBF (30V maximum)?

A: NCP3065MNTXG is specified for 3V to 40V input range, extending maximum voltage capability. Both maintain Buck/Boost topology and Analog/PWM dimming with 1.5A switch current. NCP3065MNTXG operates at 150kHz frequency versus LT3517EUF#PBF at 250kHz to 2.5MHz. Package is 8-DFN (4x4) versus 16-QFN (4x4).

Q: Can boost-only parts like TPS61169DCKR substitute for MP4603ES-LF-Z?

A: TPS61169DCKR provides step-up (boost) conversion only, not step-down (buck). Substitution is valid only for applications requiring boost topology exclusively. Input range is 2.7V to 5.5V with 1.8A switch current and PWM dimming. Package is SC-70-5 (5-pin), significantly smaller than 16-SOIC.

Q: What is the significance of operating temperature range differences?

A: MP4603ES-LF-Z operates -20°C to 85°C (TA). Most substitutes extend minimum to -40°C and maximum to 125°C (TJ). Extended range provides margin for high-temperature environments but does not affect substitution validity for standard -20°C to 85°C applications. Temperature specifications use different measurement points (TA = ambient, TJ = junction), affecting interpretation.

Q: Does package type affect substitution eligibility?

A: Package type does not disqualify substitution but requires PCB redesign. MP4603ES-LF-Z uses 16-SOIC (0.154", 3.90mm width). Substitutes use 16-QFN, 16-TSSOP-EP, 8-DFN, 8-SOIC, SOT-23-6, 12-UDFN, 10-uMAX/uSOP, SC-70-5, and 8-MLF packages. Smaller packages (8-pin and below) reduce board area but may require different thermal management approaches.

Q: Why do some substitutes lack dimming specification?

A: AL8812FDF-13 and MAX1910EUB+T do not specify dimming capability in provided parameters. These parts may support dimming through external control methods not detailed in the parameter set. Confirmation of dimming functionality requires datasheet review beyond provided specifications.

Q: Is MSL (Moisture Sensitivity Level) important for substitution?

A: MP4603ES-LF-Z specifies MSL 2 (1 Year). Most substitutes specify MSL 1 (Unlimited), indicating superior moisture resistance. MSL 1 is compatible with MSL 2 applications and provides additional reliability margin. Lower MSL values do not restrict substitution.